In my opinion, a 6, as was the case pre-expansion, or 7 team league does not make for a competitive, entertaining experience (*cough* CFL football *cough*). And in the case of a potential division without games outside the division, you can easily end up with a team having an inflated record if there's a few weak teams in the division. You need only look back to the old South or Southeast division (whatever they called it) that the Capitals dominated every year. The caps even made the playoffs as a 10th place team once because they were the division leader. Keeping games within a conference is one thing, but within just your division will skew the standings. Another consideration is whether or not the other divisions would play inter-divison games, or would everyone just play their own division?